Here is what I use to solve the problem of my AP mount not having built-in safety limits (something I really miss about my G11-G2): http://adgsoftware.com/MountWatcher/ .
The app stops the tracking if the mount tracks too far past the meridian. As an extra precaution, an Arduino cuts the power to the mount if the app is unavailable (like if the PC were to crash.) This solution will work with your Q chip. The app is free and you are welcome to use it. The (optional) Arduino watchdog will cost about $20-25 to put together.
Andy